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| From | Matthew White <mwhite@poverty-action.org> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: get current time with milliseconds? |
| Date | Tue, 23 Jul 2013 10:42:51 -0400 |
Hi Iip, For that use, check out -timer- and -profiler-. Best, Matt On Mon, Jul 22, 2013 at 11:55 PM, iip <iip.umar.rifai@gmail.com> wrote: > Hi Sergiy, > > Thanks a lot, very informatif. > > I'm going to test time performance of code repeat the code multiple > times, so based on your info, on Stata I'm only able to do it in > seconds right? > > Best, > > -iip- > > On Tue, Jul 23, 2013 at 10:35 AM, Sergiy Radyakin > <serjradyakin@gmail.com> wrote: >> Hi Iip, >> >> First, you may want to elaborate on your particular problem you are >> solving. Be careful because as we know: " The OS Components may >> contain support for programs written in Java. Java technology is not >> fault tolerant and is not designed, manufactured, or intended for use >> or resale as on-line control equipment in hazardous environments >> requiring fail-safe performance, such as in the operation of nuclear >> facilities, aircraft navigation or communication systems, air traffic >> control, direct life support machines, or weapons systems, in which >> the failure of Java technology could lead directly to death, personal >> injury, or severe physical or environmental damage. " ( >> http://technet.microsoft.com/en-us/library/cc976720.aspx ) >> >> Second, read the following article: >> http://msdn.microsoft.com/en-us/magazine/cc163996.aspx >> >> Now given that Stata is cross-platform, and that "timestamps ... from >> Windows NT are limited to a maximum resolution of 10 or 15 >> milliseconds, depending on the underlying hardware" you will have a >> decent problem to have such a precise measurement. And by that I mean >> "current time to milliseconds", I don't mean just any time close to >> current, with some milliseconds attached to it. Note that neither >> Windows XP, nor Windows Server 2003, nor earlier versions of Windows >> can't use HPET (if you count on it). >> >> In any case here is what you may want to explore, and more suggestions >> will probably come from others: >> 1) to time performance of code repeat the code multiple times, then >> you need to measure seconds; >> 2) to get the world time consult an online service, many are linked to >> atomic clocks worldwide; transmission delay is usually a fraction of a >> second (about 0.2 here) and it takes several seconds to synchronize; >> 3) to get really precise time measurement you may want to attach a GPS >> dongle and read time from there. that might give you up to a 40ns >> resolution, not sure how fast your program will be able to digest it; >> 4) to get random numbers use truernd or other similar approaches. >> >> Finally, Stata advertizes: "High-frequency data with millisecond >> resolution" here: http://www.stata.com/features/time-series/ >> But I always assumed that the above refers to the ability to >> manipulate data stored with such precise timestamps, not to generate >> and timestamp it with such high frequency. >> >> >> Best, Sergiy Radyakin >> >> On Mon, Jul 22, 2013 at 9:10 PM, iip <iip.umar.rifai@gmail.com> wrote: >>> On Thu, Jul 18, 2013 at 12:29 PM, iip <iip.umar.rifai@gmail.com> wrote: >>>> Hi All, >>>> >>>> I'm trying to get current time with milliseconds, using >>>> c(current_time) only get seconds, how to get time including a >>>> milliseconds? >>>> >>>> Thanks, >>>> >>>> -iip- >>> * >>> * For searches and help try: >>> * http://www.stata.com/help.cgi?search >>> * http://www.stata.com/support/faqs/resources/statalist-faq/ >>> * http://www.ats.ucla.edu/stat/stata/ >> * >> * For searches and help try: >> * http://www.stata.com/help.cgi?search >> * http://www.stata.com/support/faqs/resources/statalist-faq/ >> * http://www.ats.ucla.edu/stat/stata/ > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/faqs/resources/statalist-faq/ > * http://www.ats.ucla.edu/stat/stata/ -- Matthew White Senior Project Associate Innovations for Poverty Action 101 Whitney Avenue, New Haven, CT 06510 USA www.poverty-action.org * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/